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TUTORIAL 7
3D Sketch Intersections Learning Objectives After completing this tutorial, you will be able to: • Construct and use surface features in solid modeling • Incorporate surface features in part design when appropriate • Construct complex Sweep paths • Find 3D Sketch intersections Required Competencies Before starting this tutorial, you should have been able to: • Construct, constraint and dimension sketches • Project geometry on sketch planes • Sweep sketched profiles • Understand the concepts of work and placed features • Understand how to manipulate the history tree in the browser
Figure 1: Knot
The model in Figure 1 is created by finding a 3D sketch path intersection between multiple surfaces. Tutorial 7
Surface Modeling
1 Copyright 2006 JD Mather
The Design Intent is to create a complex path – in this case a knot – to demonstrate that we should be able to create any desired path for a length of tubing. There are many ways to create tubing paths, using intersecting surfaces is just one method. The method presented in this tutorial is applicable to complex sweep problems other than tubing. 1. Open the file named KNOT.ipt and drag the EOP marker below Sketch1. Extrude Sketch1 Midplane a distance of 60.
Figure 2
2. Turn off the visibility of Sketch1. Extrude Sketch2 midplane a distance of 50.
Figure 3
2
Surface Modeling
3. Start a 3D Sketch.
Figure 4
4. Click on the 3D Intersection tool and then select and edge of each of the two extruded surfaces. (It is very important where you select the surfaces. If you select on a face of the surface – only that face will be selected. If you select on an edge of the surface the entire surface will be selected.)
Figure 5
Tutorial 7
Surface Modeling
3 Copyright 2006 JD Mather
5. Undo back to the beginning. With Inventor 11 it is no longer necessary to extrude the surfaces to find the intersections. Pull the EOP marker so that only Sketch1 and 2 are visible. Start a new 3D Sketch.
Figure 6
6. Click on the 3D Intersection Curve tool and then select both sketches.
Figure 7
4
Surface Modeling
7. Turn off the visibility of Sketch1 and Sketch 2 and make Sketch3 visible.
Figure 8
8. Sweep Sketch3 as the Profile along the 3D Sketch as the Path. (Tip: You will have to reactivate the Path selection tool to select the second portion of the path as shown.
Figure 9 Tutorial 7
Surface Modeling
5 Copyright 2006 JD Mather
9. Your results should look like this.
Figure 10 10. Create a Circular Pattern of the swept feature using the y-axis as the Rotation Axis and 2 Placement instances.
Figure11
6
Surface Modeling
Figure 12
In this tutorial we learned how to create a complex 3D sweep path using the intersection of multiple surfaces or 3D sketch intersections. Compare the sketches used to create these surfaces with the top and front orthographic views in Figure 12. The surfaces were simply the centerlines (from half of the view as they are symmetrical) of these projected views. By analyzing the path in this manner we see that the problem is not so complex after all.
